Question Detail

CHM 102 P block elements Objective Question
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Question

Carbon dioxide (CO₂) and Silicon dioxide (SiO₂) are both dioxides of Group 14. What are their respective structures and physical states at room temperature and pressure?
Options
A CO₂ is a crystalline solid with a giant covalent structure; SiO₂ is a gas with a linear molecular structure.
B CO₂ is a gas with a linear molecular structure; SiO₂ is a crystalline solid with a giant covalent structure.
Correct Answer
C Both CO₂ and SiO₂ are gases with linear molecular structures.
D Both CO₂ and SiO₂ are crystalline solids with giant covalent structures.
Correct Answer

Option B is the correct answer.

Detailed Explanation

Page 19 states, 'Carbon dioxide exists as a gas at room temp & pressure.' and 'The dioxides of the other elements exist as crystalline solids with high melting points with either giant covalent or giant ionic structures.' Page 20 shows CO₂ as O=C=O (linear) and SiO₂ with a network structure.

Hint

Consider the ability of carbon vs silicon to form pi bonds and how this affects their overall structure.

Question Info

Course: CHM 102
Topic: P block elements
Type: Objective
Difficulty: Not specified
Question 1920 of 1999
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